Among evidence seized was Yawney’s iPhone, and Trithart provided the phone to the technological crimes unit so its data could be retrieved and analyzed. Among data located were a number of text messages between Redwood and Yawney’s cellphones, interspersed with numerous phone calls.

During cross-examination by defence lawyer Kevin Hill, Trithart agreed messages leading to the date of the incident suggested the two were in a rocky relationship and discussed their struggles with alcohol.

Court heart on the night of May 23 and early morning of May 24, 2015, call and text logs show repeated communication between Yawney and Redwood — including approximately one hour’s worth of argumentative messages and numerous phone calls.

Starting shortly after 2 a.m., a final string of texts suggested the situation remained tense.

“Com pick me up,” came a text from the phone identified as Redwood’s.

“Nope,” was the response from Yawney’s phone.

Minutes later, Yawney sent a string of texts to Redwood: “Bye,” “See ya,” and “good ridens.”

A significant number of brief phone calls were also made before interactions between the two wrapped up with a message from Yawney to Redwood at 2:38 a.m., stating simply, “Bye.”

It would be the last message Yawney ever sent.

Activity on her phone picked back up shortly after 7 a.m., with numerous messages coming in from a couple of friends and, in large number, from Yawney’s mother.

“Answer me. Where are you? What’s going on?” her mother texted after a series of texts and calls went unanswered.

By then, Yawney was already dead, Trithart said.

Celeste Yawney was found dead at her home in Regina on May 24, 2015.Facebook

Trithart also spoke to Internet searches Yawney performed that night, including Facebook searches for Redwood and another woman. The Facebook searches came immediately before Redwood asked Yawney to pick him up.

During cross-examination, Trithart was asked about Redwood’s emotional state during his statements to police.

“Sometimes he was quite calm …,” Trithart said. “At times, he was very emotional.”

While Hill suggested his client was sobbing uncontrollably for much of his statement, Trithart said, “He was controlled enough that he could speak with me.”

Trithart said Redwood became emotional after the investigator played a videotaped plea from an ex-girlfriend, asking him to tell the truth, and after Trithart showed Redwood a few photos from the crime scene — including what appears to be a tread mark from a shoe on Yawney’s shoulder.

He said he believed Redwood showed remorse, and that there was a concern he could be suicidal.

Trithart didn’t agree with Hill that Redwood seemed confused, stating rather that he appeared to struggle to provide information at times.